* Hair length: Longer hair requires more coffee.
* Hair thickness: Thicker hair absorbs more liquid, so you'll need more coffee.
* Desired intensity: For a subtle tint, less coffee is needed. For more noticeable color, use more coffee and a stronger brew.
General Guidelines:
* Short hair: 1-2 cups of strong coffee
* Medium hair: 2-3 cups of strong coffee
* Long hair: 3-4 cups of strong coffee
Tips for Brewing Strong Coffee:
* Use finely ground coffee beans.
* Use a French press or espresso maker for the strongest brew.
* Use a dark roast coffee.
It's always best to start with less coffee and add more if needed. You can brew more coffee while the initial batch is cooling.